I'm 18 and i'm almost done with high school(3/4 years completed;in my country that's how hs is).

Quick backstory of me in highschool:

1 year: huge beta,nice guy,borderline anorexic,shit at everything,huge self-esteem issues,bullied,manipulative,noone liked me...didn't lift

2 year: same shit as in 1st year,slowly started lifting

3 year: got jacked through quarantine went from 68kg to 85kg,people respect me,if someone disrespects me I stick up for myself and don't take shit from noone,still a people pleaser sometimes

Now all of this is great now that people respect me and don't make fun of me every second,but I'm still getting used to it.But I still think that I need to be a nice guy to fit in,but the problem is I don't because literally noone in my class lifts or has similar interests like me.So i think I need to make them happy for them to like me.( I stil have some Nice guy syndrome in me,I'm working on it by reading NMMNG for the 4th time)

I have a lot of friends at the gym,who I hang out with and are cool,but at school since noone wants me in their group because of the reputation I set up for myself since the 1st year of hs this is the problem.Groups are already established and noone wants me in so I need to fucking try my best to fit in with those people if I don't want to be seen as a social reject,who has no friends at school.

What do I do since noone wants me in their group and if I want to fit it I need to people please,to not be seen as a social reject who has no friends at school?